How to Prevent MacBooks From Being Hacked (4 Steps)

Click 'System Preferences' on the desktop dock, and click 'Security.' Alternately, click 'Apple' at the top of the desktop screen, click 'System Preferences' and click 'Security.'
Click 'Start' in the firewall section to enable the laptop's firewall, and click the checkbox next to 'Block all incoming connections.' Alternately, click 'Automatically allow signed software to receive incoming connections.' The latter option protects your computer and is a little less rigid than blocking all incoming connections.
Click 'Advanced' and click 'Enable Stealth Mode.' Click 'Advanced' to apply stealth mode, and return to the main System Preferences window.
Click 'Sharing' and de-select the checkbox next to 'File Sharing.' Close out of the window to apply the settings and exit.
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How to Get Free App Store Credits (6 Steps)

Launch your App store icon either on the iPhone, iPad or through iTunes on the computer. If an account is signed in, you'll need to sign out.
Locate the free apps you wish to download. Hit download to see if it will download with no further procedure. If not, click the 'Create New Account' link. Follow the information boxes and fill in with your info. Hit the 'None' option under payment.
Activate the account by following the email or online prompts. You now have free app download credits. You may select and download any free app in the Apple App store.
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